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TM 11-6625-2975-12
3-9.
OPERATIONAL CHECK. (CONT)
ACTION
INDICATION
Test set display status should be as follows
5. Sequentially select and enter VOR
for each selected frequency:
rf carrier frequencies of 108.00,
113.70, and 117.95 MHz.
DISPLAY
INDICATION
FROM, 000.00 RDL
RDL/DDM/MOD
(DEG)
AUDIO STATUS
STANDARD
FREQUENCY
(frequency selected) MHz
MODE
VOR
RF LEVEL
-50 dB mW
RF STATUS
PH LOCK, LEVEL CAL
TONE SELECT
30 Hz VAR, 9960 FM
FUNCTION/
No keys lit
CONTROL
DATA ENTRY
No keys lit
RF FREQ key lit
RF SELECT
If display status is not indicated as shown
above, refer test set to higher level of
maintenance.
9960 FM key lamp turns off. If not, refer test
6. Press 9960 FM key.
set to higher level of maintenance.
1020 Hz lamp lights. If not, see para 3-11.
7. Press 1020 Hz key.
No changes should occur on front panel. If any
8. Sequentially press 90 Hz, 150 Hz, 400
Hz, 1300 HZ and 3000 Hz keys.
change occurs, refer test set to higher level
of maintenance.
FREQUENCY display indicates 108.000 and MHz
9. Enter frequency of 108.00 MHz.
indicator lights. If either or both indications
do not occur as described, refer test set to
higher level of maintenance.
FROM indicator turns off and TO indicator
10. Press T/F U/L D/R key.
turns on. If not, refer test set to higher
level of maintenance.
TO indicator turns off and FROM indicator
11. Press STD key.
turns on. If not, refer test set to higher
level of maintenance.
12. Press STEP RDL DDM key.
RDL/DDM/MOD display should indicate 030.00.
if not, refer test set to higher level of
maintenance.
3-7

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